Cyanometer Postcard

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A cyanometer is a tool that lets you grade the blueness of your sky, invented in 1789 by Horace Bénédict de Saussure. This genius modern version is combined with a postcard! Simply hold up to the sky, look through the hole and then on the back write the time & shade number. Pop in the post to a friend. 148x105mm Simple brilliance by Macarena Ruiz-Tagle. Show more